You can upgrade to Windows 10 using a license key of your previous Windows 7 or 8 editions.
Now you don't need to download Virtual Drive program to mount iso img files
Windows 7 USB DVD Download Tool - ISO File Downloader & DVD/USB Burner
Create Windows Bootable USB from an ISO file by following the easiest steps
If you have lost your Windows 8 key then don't worry because in this post we will explain how to find your Windows 8 Product key.
Here in this post, we will tell you the right way to download Windows Vista ISO file.
5 Best ISO Mounting Software For Creating Virtual CD DVD Drive in Microsoft Windows 10 and 7